The National Measures for the Administration of Occupational Health Standards is a regulation formulated by the China Municipal Government to regulate and manage occupational health standards. According to this management method, the national occupational health standards are divided into two categories: mandatory standards and recommended standards. Mandatory standards refer to standards that must be observed, and violators will face legal responsibility. These standards usually involve the basic requirements of occupational health and the minimum protection measures to ensure the health and safety of employees. Recommended standards refer to suggested standards, which can be used as reference and guidance, but are not mandatory. Recommended standards usually contain more detailed and comprehensive occupational health requirements, which can help enterprises improve the level of occupational health management. These standards are formulated on the basis of scientific research, technological progress and practical experience, and have been reviewed by experts and participated by the public.